Electrical discharge vessel for the production or amplification of oscillations



Oct. 12 1926.

- 1,602,943 ,K. ROTTGARDT ELECTRICAL DISCHARGE VESSEL FOR THE PRODUCTION OR AMPLIFICATION OF OSCILLATIONS Filed August 26," 1921 I fight WJafZym/e v QM, @wyhim 22m! A T ORNE VS Patented Oct. 12 1926.

UNITED. STATES PATENT OFFICE.

KARL ROTTGARDT, OF DAHLEM, NEAR BERLIN, GERMANY, ASSIGNOR TO WESTING- HOUSE ELECTRIC & MANUFACTURING COMPANY, A CORPORATION OF PENNSYL- VAN IA.

ELECTRICAL DISCHARGE VESSEL FOR THE PRODUCTION OR OSCILLATIONS.

AMPLIFIC'ATION on Application filed August 26, 1921, Serial No. 495,594, and in Germany June 2, 1920.

The invention refers to an electrical discharge vessel for the production or amplification of oscillations which may be provided with one or more auxiliary electrodes. The invention has for its object to influence as extensively as ossible the electrons emitted from the glowing cathode, and consists in the arranging on the side of the anode opposite to the side confronting the grid electrode or electrodes one or several auxiliary electrodes which are connected with the grid electrode or electrodes existing between the anode and the cathode. There is obtained in this manner that such electrons as do not reach the anode reach in the space beyond the anode, are likewise led to the latter, whereby the utilization of the electron emission is increased. Furthermore, by a suitable development of the auxiliary electrodes constituting the subject matter of this invention, and by a proper arrangement in relation to the anode, there may be brought into play a capacitive action which promotes the production of the oscillations. As is well known, the production of oscillations by means of a vacuum tube and associated circuits is dependent upon the inherent capacity coupling between the elements of the tube, and it is this capacity coupling that is increased by the provision of the auxiliary electrode in accordance with this invention.

The drawing shows a manner of execution 'of the invention. 1 as a cathode. 2 is the usual grid or controlelectrode and 3 is an anode. On the side of anode 3 opposite to the side confronting the grid 2 or cathode 1, there is arranged according to this invention, a further auxiliary electrode 4, which is electrically connected with control electrode 2. Due to this arrangement such electrons as reach in the space above anode 3 are brought in'phase with the electrons which reach the anode immediately from the cathode through grid 2 and beyond this point there is brought 'into play by proper adjustment of auxiliary electrode 4 in relation to anode 3 a capacitive effect which by proper external connection promotes the production of oscillations; Such external connection may consist in the insertion of oscillation circuits between grid 2 and cathode 1 on one side, and between anode 3 and cathode 1 on the other side.

The connection of both subordinate auxil iary electrodes may also be effected outside the vessel and the number of these auxiliary electrodes is unlimited. To bring about special efiects there may be brought into play between the coupled auxiliary electrodes any phase displacement. Auxiliary electrodes 4 may be made either solid or grid or sievelike, or may receive any other form.

Claims: r

1. An electron-discharge vessel having a filament, a plate electrode, two grid electrodes, one on each side of said plate electrode, and a direct metallic connection maintaining said grid electrodes at the same potential.

2. An electron-discharge vessel having a filament, a plateelectrode, a grid electrode between said filament and plate electrode, a second grid electrode on the side of said plate away from said filament and means for ensuring said grid electrodes being at the same potential. v

3. An electron-discharge vessel having a cathode, an anode and a control electrode and means within the vessel for increasing the capacity coupling between the anode and the control electrode.

In testimony whereof I aflix my signature.

DR. KARL ROTTGARDT. 

